Commit 7b861a53 authored Jun 04, 2020 by Marco Elver Committed by Peter Zijlstra Jun 15, 2020

kasan: Bump required compiler version



Adds config variable CC_HAS_WORKING_NOSANITIZE_ADDRESS, which will be
true if we have a compiler that does not fail builds due to
no_sanitize_address functions. This does not yet mean they work as
intended, but for automated build-tests, this is the minimum
requirement.

For example, we require that __always_inline functions used from
no_sanitize_address functions do not generate instrumentation. On GCC <=
7 this fails to build entirely, therefore we make the minimum version
GCC 8.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Acked-by: Andrey Konovalov <andreyknvl@google.com>
Link: https://lkml.kernel.org/r/20200602175859.GC2604@hirez.programming.kicks-ass.net

parent 5ddbc408

lib/Kconfig.kasan

+4 −0

Original line number	Diff line number	Diff line
		@@ -15,11 +15,15 @@ config CC_HAS_KASAN_GENERIC
		config CC_HAS_KASAN_SW_TAGS
		def_bool $(cc-option, -fsanitize=kernel-hwaddress)

		config CC_HAS_WORKING_NOSANITIZE_ADDRESS
		def_bool !CC_IS_GCC \|\| GCC_VERSION >= 80000

		config KASAN
		bool "KASAN: runtime memory debugger"
		depends on (HAVE_ARCH_KASAN && CC_HAS_KASAN_GENERIC) \|\| \
		(HAVE_ARCH_KASAN_SW_TAGS && CC_HAS_KASAN_SW_TAGS)
		depends on (SLUB && SYSFS) \|\| (SLAB && !DEBUG_SLAB)
		depends on CC_HAS_WORKING_NOSANITIZE_ADDRESS
		help
		Enables KASAN (KernelAddressSANitizer) - runtime memory debugger,
		designed to find out-of-bounds accesses and use-after-free bugs.

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